package com.itheima.ssm.service.impl;


import java.io.IOException;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.DisposableBean;
import org.springframework.beans.factory.InitializingBean;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextAware;
import org.springframework.context.annotation.Lazy;
import org.springframework.core.io.DefaultResourceLoader;
import org.springframework.stereotype.Indexed;
import org.springframework.stereotype.Service;

/**
 * 以静态变量保存Spring ApplicationContext,可在任何代码任何地方任何时候中取出ApplicaitonContext.
 * @yanglei 2015-03-20
 */
@Service
@Lazy(false)
public class ToolSpring implements ApplicationContextAware, DisposableBean ,InitializingBean{

    private static Logger logger = LoggerFactory.getLogger(ToolSpring.class);
    private static final String NONE = "";

    private static ApplicationContext applicationContext = null;




    /**
     * 实现ApplicationContextAware接口, 注入Context到静态变量中.
     */
    public void setApplicationContext(ApplicationContext applicationContext) {
        logger.debug("注入ApplicationContext到ToolSpring:{}", applicationContext);
        if (ToolSpring.applicationContext != null) {
            logger.info("ToolSpring中的ApplicationContext被覆盖, 原有ApplicationContext为:" + ToolSpring.applicationContext);
        }
        ToolSpring.applicationContext = applicationContext;// NOSONAR
    }

    /**
     * 实现DisposableBean接口,在Context关闭时清理静态变量.
     */
    @Override
    public void destroy() throws Exception {
        ToolSpring.clearHolder();
    }

    /**
     * 取得存储在静态变量中的ApplicationContext.
     */
    public static ApplicationContext getApplicationContext() {
        //assertContextInjected();
        return applicationContext;
    }

    public static String getRootRealPath() {
        String rootRealPath = NONE;
        try {
            rootRealPath = getApplicationContext().getResource(NONE).getFile().getAbsolutePath();
        } catch (IOException e) {
            logger.warn("获取系统根目录失败");
        }
        return rootRealPath;
    }

    public static String getResourceRootRealPath() {
        String rootRealPath = NONE;
        try {
            rootRealPath = new DefaultResourceLoader().getResource(NONE).getFile().getAbsolutePath();
        } catch (IOException e) {
            logger.warn("获取资源根目录失败");
        }
        return rootRealPath;
    }

    /**
     * 从静态变量applicationContext中取得Bean, 自动转型为所赋值对象的类型.
     */
    @SuppressWarnings("unchecked")
    public static <T> T getBean(String name) {
        //assertContextInjected();
        return (T) applicationContext.getBean(name);
    }

    /**
     * 从静态变量applicationContext中取得Bean, 自动转型为所赋值对象的类型.
     */
    public static <T> T getBean(Class<T> requiredType) {
        //assertContextInjected();
        return applicationContext.getBean(requiredType);
    }

    /**
     * 从静态变量applicationContext中取得Bean, 自动转型为所赋值对象的类型.
     */
    public static <T> T getBean(String name, Class<T> requiredType) {
        //assertContextInjected();
        return applicationContext.getBean(name, requiredType);
    }

    /**
     * 清除ToolSpring中的ApplicationContext为Null.
     */
    public static void clearHolder() {
        if (logger.isDebugEnabled()) {
            logger.debug("清除ToolSpring中的ApplicationContext:" + applicationContext);
        }
        applicationContext = null;
    }

    @Override
    public void afterPropertiesSet() throws Exception {
        logger.error("进来了:" + applicationContext);

        System.out.println("进来了");
    }

    /**
     * 检查ApplicationContext不为空.
     */
    /*private static void assertContextInjected() {
        Validate.validState(applicationContext != null, "applicaitonContext属性未注入, 请在applicationContext.xml中定义ToolSpring.");
    }*/
}
